Stove or furnace



NITED STATES ATENT FFICE.

'STOVE OR FURNACE.

SPECIFICATION forming part' of Letters Patent No. 268,483, datedDecember 5, 1882,.

Application filed May 15, 1882. (No model.)

To all whom ii -may concern:

B it known that I, DANIEL M. GRAHAM, of Boston, in the county ofSuffolk, of the State of Massachusetts, have invented a new and usefulImprovement in Stoves or Furnaces; andI do hereby declare the same to bede scribed in the following specification and represented in theaccompanying drawings, of which- Figure 1 is a vertical section of astove provided with my invention, the nature of which is defined by theclaim hereinafter set forth. Fig. 2 is a vertical section of such stove,showing but one air-induct to its air heating and discharging drum. Fig.3 is a horizontal section of the stove and its drum.

in the drawings, A denotes a common stove or furnace for the combustionof fuel, its grate being shown at a, the ash-chamber at b, the doorwayfor the supply of fuel at c, and the smoke-discharge flue or pipe at d.l'Vithin the upper part of the stove, and above the space for receptionof the fuel, is a drum, B, having a series of flue-pipes, 0, extendingthrough it from its bottom to its top,andopening through both. Suchdrumalso has made in its bottom a series of educts or holes,f, for, thedischarge of heated air downward into the fuel or the flame thereof,when such fuel may be in a state of combustion. Into this drum, eitherat its upper or lower part, is led an air-induction pipe. In Fig. 1 twoof such pipes are shown at G and I), one of them-via, that marked Obeing partly outside of the stove and opening into the upper part of thedrum. The other pipe or air-induct, after passing into the stove justabove its grate, extends upward within the stove to the drum and opensinto it at its central part. This latter pipe I provide with a series ofholes, 9, for the discharge of air from it laterally into the smoke orgas space ofthe stove. Each air-induct hasinita damper for regulatingthe flow of air through it, one of such dampers being shown at h and theother at i.

In the above-described stove the smoke and gases escaping from the fuelwhen in combustion pass around and in contact with the drum and upwardthrough its flue-pipes to thedischarge-flue, the drum in the meantimebeing heated by them, so as to impart heat to the air that may enter itby either or both the induction-pipes. Such air, after having been thusheated, will flow in currents out of the bottom of the drum and upon thefuel or smoke and gases eliminated therefrom, and thereby greatly aid orfacilitate combustion of such fuel, smoke, and gases, and consequentlyimprove the heating-powers of the stove.

By having the two air-inducts-one arranged within and the other withoutthestove,in manner as represented, and each provided with a dam per, assetforththe air can be introduced to great advantage into the drum andstove, and its passage therein can be regulated, as circumstances mayrequire, for obtaining a practically complete combustion of the smokeand gases discharged from the fuel.

From the above it will be seen that in the drum there is no flueextending up through it axially of it, whether for the passage of smokeor air through it, but that it has a series of smoke lines or pipesgoing through it from top to bottom of it, opening through both, all ofwhich differs from anything shown in either of 1theUnited States PatentsNos. 7,164 and 49,652.

I claim- The combination of the stove and the drum arranged within it,and provided with finepipes and air-educts, disposed as set forth, withthe two hot-air induction-pipes having dampers, and arranged with suchstove and drum substantially as represented.

It. H. EDDY, E. B. PRATT.

